4.138
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Group Settings (SET Command)
Use the SEL-321 Relay Application Guide for the SEL-700G Relay
The load-encroachment logic and the settings in the SEL-700G are the same
as those in the SEL-321. Refer to SEL Application Guide AG93-10, SEL-321
Relay Load-Encroachment Function Setting Guidelines, for applying the load-
encroachment logic in the SEL-700G. Note that Application Guide AG93-10
discusses applying the load-encroachment feature to phase distance elements
in the SEL-321. The principles and the settings example are applicable to the
SEL-700G.
Power Elements
You can enable as many as four independent three-phase power elements in
the SEL-700G Relay. Each enabled element can be set to detect real power or
reactive power. When voltage inputs to the relay are from delta-connected
PTs, the relay cannot account for unbalance in the voltages in calculating the
power. Take this into consideration in applying the power elements.
With SEL
OGIC
control equations, the power elements provide a wide variety
of protection and control applications. Typical applications are:
➤
Overpower and/or underpower protection/control
➤
Reverse and/or low-forward power for generator antimotoring
protection
➤
VAR control for capacitor banks
➤
Supervision of the third-harmonic neutral undervoltage element
➤
Detection of power export in DG applications
Generator motoring occurs when prime mover input power to the generator is
cut off while the generator is connected to the system. When this happens, the
generator acts as a synchronous motor to drive the prime mover shaft. In steam
turbine prime mover applications, generator motoring can quickly damage the
turbine by causing overheating. In applications of other prime movers,
motoring can cause mechanical damage and/or unsafe operating conditions.
Table 4.38
Power Element Settings
(Sheet 1 of 2)
Setting Prompt
Setting Range
Setting Name :=
Factory Default
a
ENABLE PWR ELEM
N, 1–4
N, 1–4
EPWRX := 2
EPWRY := N
3PH PWR ELEM PU
OFF, 1.0–6500.0 VA
(secondary VA)
b
3PWRm1P := 50
PWR ELEM TYPE
+WATTS, –WATTS,
+VARS, –VARS
PWRm1T := -WATTS
PWR ELEM DELAY
0.00–240.00 s
PWRm1D := 20.00
3PH PWR ELEM PU
OFF, 1.0–6500.0 VA
(secondary VA)
b
3PWRm2P := 25.0
PWR ELEM TYPE
+WATTS, –WATTS,
+VARS, –VARS
PWRm2T := +WATTS
PWR ELEM DELAY
0.00–240.00 s
PWRm2D := 1.00
3PH PWR ELEM PU
OFF, 1.0–6500.0 VA
(secondary VA)
b
3PWRm3P := OFF
PWR ELEM TYPE
+WATTS, –WATTS,
+VARS, –VARS
PWRm3T := +VARS
Содержание SEL-700G Series
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